Metalwork Colossus, The Ooze, Arwen, Weaver of Hope, and Yahenni, Undying Partisan

Prerequisites

• Metalwork Colossus in hand
• The Ooze on the battlefield
• Arwen, Weaver of Hope on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Cast Metalwork Colossus by paying , which enters with at least two +1/+1 counters on it due to Arwen
2. Activate Yahenni by sacrificing Metalwork Colossus
3. When Metalwork Colossus dies, The Ooze triggers, creating a Mutagen token for each +1/+1 counter Metalwork Colossus had
4. Resolve the Yahenni ability
5. Activate Metalwork Colossus by sacrificing two Mutagens, returning it from your graveyard to your hand
6. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite Mutagen tokens
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite storm count